Phase sensitivity approaching quantum Cramer-Rao bound in a modified SU(1,1) interferometer
arXiv:2012.04236 · doi:10.1103/PhysRevA.103.032617
Abstract
SU(1,1) interferometers, based on the usage of nonlinear elements, are superior to passive interferometers in phase sensitivity. However, the SU(1,1) interferometer cannot make full use of photons carrying phase information as the second nonlinear element annihilates some of the photons inside. Here, we focus on improving phase sensitivity and propose a new protocol based on a modified SU(1,1) interferometer, where the second nonlinear element is replaced by a beam splitter. We utilize two coherent states as inputs and implement balanced homodyne measurement at the output. Our analysis suggests that the protocol we propose can achieve sub-shot-noise-limited phase sensitivity and is robust against photon loss and background noise. Our work is important for practical quantum metrology using SU(1,1) interferometers.
References in corpus (20)
- Quantum Optical Metrology -- The Lowdown on High-N00N States
- Quantum metrology with entangled coherent states
- Quantum Metrology with Two-Mode Squeezed Vacuum: Parity Detection Beats the Heisenberg Limit
- Mach-Zehnder Interferometry at the Heisenberg Limit with coherent and squeezed-vacuum light
- Detection loss tolerant supersensitive phase measurement with an SU(1,1) interferometer
- Coherent-Light Boosted, Super-Sensitive, Quantum Interferometry
- Phase sensing beyond the standard quantum limit with a truncated SU(1,1) interferometer
- Pumped-up SU(1,1) interferometry
- The phase sensitivity of an SU(1,1) interferometer with homodyne detection
- Phase sensitivity at the Heisenberg limit in an SU(1,1) interferometer via parity detection
- Gaussian state interferometry with passive and active elements
- Parity Measurement is Sufficient for Phase Estimation at the Quantum Cramer-Rao Bound for Path-Symmetric States
- Optimal phase measurements with bright and vacuum-seeded SU(1,1) interferometers
- Parity Detection in Quantum Optical Metrology Without Number Resolving Detectors
- Nearly Optimal Measurement Scheme in a Noisy Mach-Zehnder Interferometer with Coherent and Squeezed Vacuum
- Optimized phase sensing in a truncated SU(1,1) interferometer
- Conclusive Precision Bounds for SU(1,1) Interferometers
- Phase estimation of phase shifts in two arms for an SU(1,1) interferometer with coherent and squeezed vacuum states
- Sub-shot-noise-limited phase estimation via SU(1,1) interferometer with thermal states
- Classical Inputs and Measurements Enable Phase Sensitivity beyond the Shot-Noise Limit
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